I don't give a damn what anybody says, I love Sarah McLachlan and Tori Amos. This really throws people off because a majority of the music that I listen to is really heavy and aggressive. What people don't realize is that I love music that is very well written and has passion behind it. Which is a major reason why I love metal, but both Sarah and Tori have very well written and passionate music, but in a different style. I wouldn't call myself a music snob, because I don't think anybody's opinion is better than someone elses. I will however, call myself a music connoisseur.
I wouldn't call it a guilty pleasure, but I know that a lot of people hate Linkin Park. I'm not a fanboy or anything, but I know talent when I see it. I know a lot of people don't like them now because they got really popular really fast. In fact I can't stand people that don't like something simply because they're no longer the only person that knows that they exist.
Women are not generally found in the rock/hard rock genre, but Amy Lee belongs there. I think she is an incredible singer and as a rock/hard rock/metal fan, I never thought I would say that I wish there were more female singers in this area, but I do.
Here are a few suggestions for you if you don't think woman aren't prominent in the heavy music scene: Lacuna Coil, Nightwish, The Gathering, The Birthday Massacre, Leaves' Eyes, Arch Enemy, Otep, Kittie, Tristania, I could go on and on. All are fronted by female vocalists. A lot of them have beautiful singing voices, such as Christina Scabbia from Lacuna Coil and Anneke van Giersbergen from the Gathering. Whereas Angela Gossow from Arch Enemy has a voice that you could have sworn came from a very pissed off man.
Heavy is good, heavy is reliable. If it doesn't work, you can always hit them with it.